Quad Rail is 16.9 ounces vs. 12.5 Ounces for the Super Slim. Overall, I’d say I prefer the Super Slim
12.5 Ounces based on:
Proudly Designed and Manufactured in USA
13″ Single Rail, Super Slim, Free-floating Handguard with Proprietary Attachment Design and Extremely Compact Profile
Continuous Picatinny Top plus 3 User Detachable 2-slot Rail Sections
Ergonomic Slim Tubular Profile for Most Positive Handling, Integral Anti-rotation Tab for Rock-solid Locking
Accommodates Low-profile Gas Block
Please note, that I think I put it on the wrong shoulder. Being right handed but shooting left handed becomes confusing for me. But I wouldn’t say there’s any “right” way to wear it. Whatever works for you.